Aechibald douglas beyce-douglas



(No Model.)

A. D. BRYGE-DOUGLAS.

, LINK MoTIoN PON. ENGINES. No. 345,617. Patented July 13,1886.

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UNITED STATES .PATENT OFFICE.

ARCHIBALD DOUGLAS BRYCE-DOUGLAS, OF SEAFIELD, ARDROSSAN, COUNTY OF AYR,SCOTLAND.

LINK-M OTION FOR ENGINES.

SPECIFICATION forming part of Letters Patent No.3f15,617, dated July 13,1886.

Application tiled September 8,1885. Serial No.1'76,516. (No model.)Patented in England May 28, 1885, No. 6,506; in Germany J'uly 18,1885,No. 34,501; in Austria-Hungary October 19, 1885, No. 26,663 andNo.'54,903,- in France November 4, 1885, No.

172063, and infeigium November 5,1885, No. 70,744.

To all whom, it may concern:

Be it known that I, ARCHIBALD DoUGLAs BEYcE-DoUGLAs, a subject of theQueen of Great Britain, residing at Seaiield, Ardrossan, in the countyof Ayr, Scotland, have invented a new and useful Link Motion forWorkingr the Slides or Valves of Steam and other Fluid Pressure Engines,(for which I have obtained patents in Great Britain, dated May 28, 1885,No. 6,506; in Germany, dated July 18, 1885, No. 34,501; in France, datedNovember 4, 1885, No. 172,063; in Belgium, dated November 5, 1885, No.70,744, and in Austria-Hungary, dated October 19, 1885, N o. 26,663 andNo. 54,993,) of which the following is a specification.

My invention relates to the arrangement of levers and links for workingthe slides or valves of steam or other fluid pressure engines, to stop,start, reverse, or to vary eX- pansion. The motion for this purpose isderived from that of the piston-rod, combined with a movement obtainedfrom the connecting-rod.

curved link 4 on a pin, 3; 8, lever pivotedY at 7 to the connecting-rodof the engine and sliding with its vother end in a guide, 9; 10, linkpivoted to lever 8, and connected by link 12 to arm of curved link 4;11, radius-rod supporting-links 10 and 12; 5, connectingrod to slide rod6; 13 14, gear for shifting rod 5 iu curved link.

I provide a beam, 1, (which may be that for working the air-pump,)mounted on a stationary fulcrum, 2, and connected at one end by a linkto the pistonrod cross-hcad, so

as to oscillate in time with the piston. On a pin, 3, on the beam 1, Imount a curved link, 4, to which is iitted a sliding block, linked by arod, 5, to the slide or valve-rod 6. To a pin, 7, on the connecting-rod,I joint one end of a lever, 8, the other end being jointed to a pin on asliding block, 9, which moves in a curved or straight guide. I connect apin on the lever 8,by a link, 10, to a pin joining the end of theradius-rod 11, (which is pivoted on a stationary fulcrum,) and of alink, 12, jointed to the upper arm of the curved link 4, which thusreceives a motion corresponding nearly with that of the link usuallyWorked by two eccentrics. The rod 5 is linked by a rod, 13, to an arm',14, by moving` which the block at the lower end ofthe rod 5 can be slidalong the curved link 4, and thus the slide or valve rod 6 can be madeto receive movements corresponding with those obtained by the use ofordinary double eccentrics, and link-motion to suit either direction ofthe engines motion, and various degrees of cut-off and expansion. rllheupanddown motion imparted to curved link 4 by beam 1, combined with therocking motion imparted toit by lever 8 and links 10 11 12, results in acompound motion similar to that of an ordinary link-motion.

Having thus described the nature of my invention, and in what manner thesame is to be performed, I' claim- In combination with the lever 1,oscillating on a fixed fulcrum in time with the piston, and the curvedlink 4, mounted on the lever, and iitted with a sliding block connectedto the valve-rod, the lever 8,and the links 10, l1, and 12,communicating rocking movement from the connectingrod to the link 4,substantially as described. l

In testimony whereof Ihave signed my name to this specitication, in thepresence of two subscribing Witnesses, this 24th day of Au gust, A. D.1885.

A. D. BRYCE-DOUGLAS.

Witnesses: l

JAMEs SYME, ANDREW LAING.

